What are the two most populous countries in Africa, whose combined populations account for over 25% of Africa's population?

a. Nigeria and Ethiopia
b. Nigeria and the Democratic Republic of Congo
c. Kenya and Ethiopia
d. Kenya and the Democratic Republic of Congo
e. South Africa and Ethiopia


a

Environmental & Atmospheric Sciences

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What is an example of a K-selected species?

A. goats B. bacteria C. whales D. flies E. frogs

Environmental & Atmospheric Sciences

The process whereby the earth's life changes over time through changes in genes of populations of organisms in succeeding generations is called ____.

A. emigration B. mutation C. natural selection D. evolution E. genetic drift

Environmental & Atmospheric Sciences

The wind-chill index takes into account the wind speed at about ____ above the ground instead of the where official readings are usually taken

a. ?10 m (33 ft) b. ?5 m (16.5 ft) c. ?100 m (330 ft) d. ?1.5 m (5 ft) e. ?15 m (50 ft)

Environmental & Atmospheric Sciences

____ connect(s) atoms by sharing the energy of paired electrons

a. Covalent bonds b. Hydrogen bonds c. Cohesion d. Adhesion

Environmental & Atmospheric Sciences